getnetent.c revision 1.4
1/* $NetBSD: getnetent.c,v 1.4 1995/02/25 06:20:33 cgd Exp $ */ 2 3/* 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36#if defined(LIBC_SCCS) && !defined(lint) 37#if 0 38static char sccsid[] = "@(#)getnetent.c 8.1 (Berkeley) 6/4/93"; 39#else 40static char rcsid[] = "$NetBSD: getnetent.c,v 1.4 1995/02/25 06:20:33 cgd Exp $"; 41#endif 42#endif /* LIBC_SCCS and not lint */ 43 44#include <sys/types.h> 45#include <sys/socket.h> 46#include <netinet/in.h> 47#include <arpa/inet.h> 48#include <netdb.h> 49#include <stdio.h> 50#include <string.h> 51 52#define MAXALIASES 35 53 54static FILE *netf; 55static char line[BUFSIZ+1]; 56static struct netent net; 57static char *net_aliases[MAXALIASES]; 58int _net_stayopen; 59 60void 61setnetent(f) 62 int f; 63{ 64 if (netf == NULL) 65 netf = fopen(_PATH_NETWORKS, "r" ); 66 else 67 rewind(netf); 68 _net_stayopen |= f; 69} 70 71void 72endnetent() 73{ 74 if (netf) { 75 fclose(netf); 76 netf = NULL; 77 } 78 _net_stayopen = 0; 79} 80 81struct netent * 82getnetent() 83{ 84 char *p; 85 register char *cp, **q; 86 87 if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "r" )) == NULL) 88 return (NULL); 89again: 90 p = fgets(line, BUFSIZ, netf); 91 if (p == NULL) 92 return (NULL); 93 if (*p == '#') 94 goto again; 95 cp = strpbrk(p, "#\n"); 96 if (cp == NULL) 97 goto again; 98 *cp = '\0'; 99 net.n_name = p; 100 cp = strpbrk(p, " \t"); 101 if (cp == NULL) 102 goto again; 103 *cp++ = '\0'; 104 while (*cp == ' ' || *cp == '\t') 105 cp++; 106 p = strpbrk(cp, " \t"); 107 if (p != NULL) 108 *p++ = '\0'; 109 net.n_net = inet_network(cp); 110 net.n_addrtype = AF_INET; 111 q = net.n_aliases = net_aliases; 112 if (p != NULL) 113 cp = p; 114 while (cp && *cp) { 115 if (*cp == ' ' || *cp == '\t') { 116 cp++; 117 continue; 118 } 119 if (q < &net_aliases[MAXALIASES - 1]) 120 *q++ = cp; 121 cp = strpbrk(cp, " \t"); 122 if (cp != NULL) 123 *cp++ = '\0'; 124 } 125 *q = NULL; 126 return (&net); 127} 128